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Changes in CTDB 2.2
===================
User-visible changes
--------------------
* The "stopped" event has been removed.
The "ipreallocated" event is now run when a node is stopped. Use
this instead of "stopped".
* New --pidfile option for ctdbd, used by initscript
* The 60.nfs eventscript now uses configuration files in
/etc/ctdb/nfs-rpc-checks.d/ for timeouts and actions instead of
hardcoding them into the script.
* Notification handler scripts can now be dropped into /etc/ctdb/notify.d/.
* The NoIPTakeoverOnDisabled tunable has been renamed to
NoIPHostOnAllDisabled and now works properly when set on individual
nodes.
* New ctdb subcommand "runstate" prints the current internal runstate.
Runstates are used for serialising startup.
Important bug fixes
-------------------
* The Unix domain socket is now set to non-blocking after the
connection succeeds. This avoids connections failing with EAGAIN
and not being retried.
* Fetching from the log ringbuffer now succeeds if the buffer is full.
* Fix a severe recovery bug that can lead to data corruption for SMB clients.
* The statd-callout script now runs as root via sudo.
* "ctdb delip" no longer fails if it is unable to move the IP.
* A race in the ctdb tool's ipreallocate code was fixed. This fixes
potential bugs in the "disable", "enable", "stop", "continue",
"ban", "unban", "ipreallocate" and "sync" commands.
* The monitor cancellation code could sometimes hang indefinitely.
This could cause "ctdb stop" and "ctdb shutdown" to fail.
Important internal changes
--------------------------
* The socket I/O handling has been optimised to improve performance.
* IPs will not be assigned to nodes during CTDB initialisation. They
will only be assigned to nodes that are in the "running" runstate.
* Improved database locking code. One improvement is to use a
standalone locking helper executable - the avoids creating many
forked copies of ctdbd and potentially running a node out of memory.
* New control CTDB_CONTROL_IPREALLOCATED is now used to generate
"ipreallocated" events.
* Message handlers are now indexed, providing a significant
performance improvement.
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